Island



S. W. BAKER, OF PROVIDENCE, RHODE ISLAND.

IBLANKET FOR PRINTING.

Specification of Letters Patent No. 26,467, dated December 20, 1859.

To all whom 'it may concern:

Be it known that I, SETH W. BAKER, of

Providence, in the county of Providence and State of Rhode Island, haveinvented certain new and useful Improvements in Blan- Akets used forPrinting Fabrics, and that the following description, taken inconnection with the accompanying drawings, hereinafter referred to,forms a full and exact specification of the same, wherein I have setforth the nature and principles Vof my said improvements, by which myinvention may 'be distinguished from all others of a similar class,together with such parts as I claim and desire to have secured to me byLetters Patent.

The figures of the accompanying plate of drawings represent myimprovements.

Figure 1 is a top view of a portion of a printing blanket. Figs. 2 and 3are sections ffif the same, showing different forms of surace. A

The endless blanket heretofore and now commonly used in machines forprinting calicos and other fabrics, consists of a sheet or band ofrubber havin a smooth surface, and it is customary an necessary to useprinting cloths called grays placed between the said rubber blanket orband and the white or fabric to be printed, to prevent the coloringmatter deposited upon the said blanket by the printing rollers which arewider than the piece to be printed-from iowing back upon and blurringthe edges of the white. But the use of these grays is troublesome andexpensive as they are employed but once for this urpose and are thenbleached into white and afterward printed, thus requiring the keeping onhand of a large stock of grays and printed goods. It is therefore verydesirable to avoid the use of the grays and yet prevent the coloringmatter from flowing back upon the edges of the print, and for thisreason it has often been attempted though previous to my inventionunsuccessfully,to use `an elastic blanket alone, without a grayinterposed between it and the fabric to be printed, especially as therubber blanket affords an elastic bearing surface to the rint and onewhich is peculiarly susceptile to the action of the engraved printingrollers, thereby causing the fabric to receive every line, even the mostdelicate, from the rollers, with great distinctness.

The present invention, by which I am enabled to use anAelastic blanketand dispense with .the use of grays l between it and the A fabric to beprinted, consists in forming a new kind of india rubber orgutta perchaor other elastic blanket havingeither `its edges or mar ins, `or thewhole of its "surface suliicient yAroughened to prevent A,the ,l

coloring matter received `b printing rollers from running or flowingback upon the edges of the fabric being printed. This enables me also,`assuch1"a blanket can be made without seams or joints to avoid the badeffects produced Ibythe AA A t seams of the Ora s heretofore necessarilused, as herein above sta-ted which consist of it from the AA f stripssewed together, the said seams caus-` ing an impression uponthe print. f

The compositions of which mynnproved i blanket ismade, canofcoursebevery much varied, but I have found good results, by

using the following: I take 8 `lbs; of'rubber or gutta percha 4L lbs. ofzinql lbgof sulfur and lb. of magnesia and mix or grind them togetherand roll this composition into a sheet 1n any of the modes wellknown byi A f rubber manufacturers, and unite the ends so as to form an endlessblanket. The sheet may then be cured or vulcanized in the usual manner.I then form roughened selvages upon the blanket or roughen the wholesurface of the same by any suitable means,-` such as by the use of emerywheels or any 1 A other proper manner. 1;The roughened sur-A t face mayof course` vary in its coarseness or it may be formed .bylining or by Ascoring it, but it should be oflsuch aAnature as to slightly absorb thecoloringmatter orsuiii` ciently to prevent the colors `fromf"running orflowing upon the blanket." A y y l l It will be obvious that -my newprinting of wall and other pa ers.

Havingthus descri ed y`improveinents,` A `10o` What I claim asmyinvention and desire I shall state my claim `as follows:` A

Witnesses:

JOSEPH GAvETT, ALBERT W. BRowN.

yblanket may also be applied `to the printing s.`w.BAKEE. y y

